diff --git a/.gitignore b/.gitignore
index 17e801f..a9a5d3b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 SOURCES/slf4j-1.7.28.tar.gz
+/slf4j-1.7.28.tar.gz
diff --git a/.slf4j.metadata b/.slf4j.metadata
new file mode 100644
index 0000000..f69b98e
--- /dev/null
+++ b/.slf4j.metadata
@@ -0,0 +1 @@
+f57e8e97d434bdcd8ba87ab9933d8de64bafb071 slf4j-1.7.28.tar.gz
diff --git a/sources b/sources
index 36ff43f..538624a 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA1 (slf4j-1.7.28.tar.gz) = f57e8e97d434bdcd8ba87ab9933d8de64bafb071
+SHA512 (slf4j-1.7.28.tar.gz) = 3eb81e8fefe85f5cc9acf3ac17d0e7c5d9f82f44e10279e7f623f1bf1301cf55dfb67ee9ad29464739c4fe4ea938aecc8d75b093426e9928de81752f80ef391f